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    Engine Running Loudly – Inspections, Diagnostics & Repairs

    Why is your engine louder than normal?

    It is normal for your engine to produce noise. However, a loud engine can often point to problems in your engine, engine mounts or exhaust system.

    Excess engine noise is often caused by rumbling or shaking within the engine bay, although it can also be caused by high RPM. There are a lot of different problems that can cause your engine to rumble or have higher RPM. These causes can range in severity.


    Causes of a loud engine:

    1. Damaged engine mounts

    If your engines rubber mounts are damaged then your engine may be in direct contact the chassis / vehicle frame which can send severe vibrations through the car, and produce unusually loud noises.

    Also, when you change up or down gears you may hear a thud or bank as the engine flexes more than it should on the broken engine mounts, and hits the car frame / chassis.

    2. Damaged muffler

    Inside your engine, a lot of loud noise is produced. The muffler is an exhaust component that helps to reduce noise from your vehicle.

    Since it is frequently exposed to heat and contaminants, the muffler can crack or become rusted. This can reduce its functionality, resulting in the car producing much more noise.

    3. Faulty idle control valve

    The idle control valve reduces your vehicles engine rpm to a suitable level when the vehicle is idling. The idle control valve can often malfunction due to carbon buildups in your engine. When it malfunctions, you may experience faster / rougher idling which produces more engine noise.

    4. Faulty oxygen sensors

    The oxygen sensors measure how much air is entering your engine. Your vehicle’s onboard computer then uses this information to determine how much fuel should be added to the engine.

    A malfunctioning oxygen sensor will result in too much/not enough fuel entering the engine. This can cause the engine to run roughly and create more vibration and noise.

    5. Dirty mass airflow sensorMass Airflow Sensor

    The mass airflow sensor measures how much air enters the engine. The mass airflow sensor is located before the intake manifold, allowing it to detect how much air is flowing into the engine at different engine rpm’s.

    If the mass airflow sensor fails, an incorrect air/fuel mixture will enter your engine, causing it to run roughly and therefore louder.

    6. Damaged engine mechanical parts

    Broken, worn or loose mechanical parts of your engine can make a lot of under bonnet noise. For example, if you have a worn valve rocker arm, or tappet it will make a loud clicking / rattling type noise at half the engine RPM.

    If you have any kind of bearing failure of any internal engine part or externally driven engine part then this is likely to be a more constant rumble / grinding type noise.


    Engine & Exhaust Repairs in Hamilton

    Is your engine running more roughly / loudly than normal? At Grimmer Motors, we offer reliable, effective engine / exhaust repairs.

    A problem in the engine or exhaust can become worse over time, causing more damage to your car and resulting in an future expensive repair. For this reason, we recommend that you bring your vehicle in as soon as you notice a problem.

    We use the latest state of the art tools to quickly diagnose the cause of your car running roughly / loudly. If necessary, we can provide excellent, high-quality repairs, allowing your car’s engine and exhaust to run healthily again. For excellent, high quality engine / exhaust repairs in Hamilton, contact Grimmer Motors today!




    Phone: 07 855 2037

    Email: office@grimmermotors.co.nz

    Address: 998 Heaphy Terrace, Fairfield, Hamilton

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